Facebooksays that users of its mobile newsreader app “Paper” are using it a lot. How many users there are remains a mystery.

The social network on Friday said the average person who uses the app, which launched in January as the first product developed by its Creative Labs team, looks at a whopping 80 stories a day. But Facebook has given no indication of how many people have downloaded the app.

Paper includes many of Facebook’s traditional features, like News Feed and messaging, but also acts as an aggregator. The app grabs articles that people have shared on Facebook and divides them into separate sections for news, business, sports and others.

Paper, which is available only for the iPhone, launched with much fanfare in January, but quickly fell down in the iOS rankings. According to App Annie, which tracks Apple’s App Store rankings, Paper has steadily dropped in popularity since March, when it was ranked in the top 100. It hit a low of 1,480 last week.

Facebook’s newly-released internal numbers suggest people who do use the app are using it often.

Facebook has said it’s planning on releasing several new apps in the coming year. Some of those apps will be spinoffs of features already on Facebook’s mobile app or its desktop platform.

Facebook also released an update to Paper Friday that included new “covers” for the articles that Facebook said would make it easier to find articles from publications. Facebook cited Fox News and Bloomberg News, among others, as examples of publishers that can be found on Paper.